13-2x=4,3x+4×0.5,5（x+4）=55,9÷1.5x=8,1.3x+x=13.8,x-0.7x=6.9,2x-8=1.4,1.8÷x=4求方程解的式子,

保证全对x＝9/2第二个题不对x＝7 x＝4/3x＝6 x＝23 x＝4.7 x＝0.45

13-2x=4
-2x=4-13
-2x=-9
x=4.5
3x+4*0.5=9.8
3x=9.8-2
3x=7.8
x=2.6
5(x+4)=55
x+4=11
x=11-4
x=7
9/(1.5x)=8
9=8*1.5x
12x=9
x=0.75
1.3x+x=13.8
2.3x=13.8
x=6
x-0.7x=6.9
0.3x=6.9
x=23
2x-8=1.4
2x=1.4+8
2x=9.4
x=4.7
1.8x=4
x=4/1.8
x=9分之20